The best advice i can give, think it was mentioned already though, is to have fun.

Also, take a camera and post tons of pics, we like action shots and "kill cams"

lol

also, make sure that you know your marker in and out, i cant count how many times i have had some issue that required field stripping my marker in a firefight. (not fun, btw. lol) bring rags to clean your gear when you are off the field. if you can, get extra o-rings for our markers and an extra lense for your mask, just in case....

the other important thing ive learned from long scenario games,wear comfortable shoes.